Coupling



FIG. 1 is a rear perspective view of the coupling;

FIG. 2 is a left-side view of the coupling of FIG. 1 ;

FIG. 3 is a right-side view of the coupling of FIG. 1 ;

FIG. 4 is front view of the coupling of FIG. 1 ;

FIG. 5 is a rear view of the coupling of FIG. 1 ;

FIG. 6 is a top view of the coupling of FIG. 1 ;

FIG. 7 is a bottom view of the coupling of FIG. 1 ; and,

FIG. 8 is a front perspective view of the coupling of FIG. 1 .

The broken lines in the drawings illustrate portions of the coupling and form no part of the claimed design. 

CLAIM The ornamental design for a “coupling,” as shown and described. 